Refrigerator



FIG. 1 is a perspective view of a refrigerator showing our new design;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is a left side view of FIG. 1;

FIG. 5 is a back view of FIG. 1; and,

FIG. 6 is a top plan view of FIG. 1. 

The ornamental design for a refrigerator, as shown and described. 